UK Spec EN17T - Material Properties & Modern Specification

Emergency Number ?? I thought EN stood for EuroNorm.

My understanding is that the EN (Emergency Number) material series originated in the Second World and the then urgent need to standardise steel material specifications across UK industry. Subsequently, in the 1950's these were wrapped up in a BS series - since much revised and 'pruned' to eliminate redundant/obsolete/superseded materials.

Unfortunately I cannot trace the EN17T spec or indeed find a cross reference index to whatever superseded it................

You could be right, it's not something I've ever heard of.

But putting EN standards into Google comes up with a lot about European standards. Irritatingly, the sites I looked at don't say what EN actually stands for, though I'm fairly sure it's EuroNorm.

Trying Emergency Number gives information on phone nos to dial in an emergency.

EN Euro Number vs. Emergency Number.

Now I'm starting to feel like an old timer. I remember the posting where we tried to decide if WD-40 was short for War Department formula 40 or Water Dispersant formula 40. With a Google search I found that posting way back in 2008. That was way back when we still had SparkStation.

MacReadys handbook says En is Euronorm & that En17 has no direct equivalent in the newer UK standards. En 17 is 0.3/0.4% C, 0.1/0.35% Si, 1.3/1.8% Mn, 0.35/0.55% Mo, 0.05% max. S, 0.05% max. P if that helps

Nigh - really helpful, thanks, at least we now know the material basic spec. Next step is its properties and behaviours under load, relative to currently available steel alloys.

I need material with equivalent or better material properties, especially fatigue properties in tension within the thread form.

EN 16T and EN24T bright drawn stock bar are both still available in the UK - does anyone feel able to advise on their suitability?

The material is needed for replacement 4.500 inch long waisted studs, having 7/16 UNC and UNF thread forms at either end. They are for an automotive application: to retain crankshaft main bearing caps within an all aluminium engine's crankcase assembly.

What would you suggest as an equivalent modern material spec for turned thread form studs?

My handbook has no physical properties, nor do any of the other books or charts that I have which makes it impossible to suggest an alternative. The 'T' suffix shows that it would have been in a hardened condition but to what degree we don't know.

Thanks......the quest for a suitable alternative material continues!

This from Total Materia (I got a free trial). I tried to copy the data but can't get it into a format you could read so go to Total Materia (yes it is spelt that way).

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Search for En17 to get chemical & physical properties & 1 close equivalent although this is still not for the heat treated 'T' condition. (This will only work for 1 month from today)

Hi Nigh, Many thanks for link and site access info - very helpful.

Could you contact the company that made the engine and request two new studs? Or perhaps try eBay for replacement studs. Not knowing the exact application makes it difficult to offer suggestions that are helpful. Good luck!